Improvement in steam vacuum-pumps



` W'. BURDUN.' ASteam Vacuum Pumps.

No l52,896, f Patenreduuly'mnm. y

THE Gaume coAFHuYo-Lm-Hsa. 4l PARK Pucsmfr.

' To all whom it may concern.'

` having been formed in the vessel A by the UNITED STATES PATENT FFICE.

VILLIAM BURDON, OF BROOKLYN, NEWr YORK.

IMPROVEMENT IN STEAM VACUUM-PUMPS.

Specification forming part of Letters Patent No. 152,896, dated July 14,1874; application filed December 17, 1872.

Be it known that I, WILLIAM BURDON, of Brooklyn, in the county of Kingsand State of New York, have invented an Improvement in Steam Vacuum-Primps, of which the following is a specification:

This invention consists in the combination of a double-seated valve withseats provided on the vacuum-vessel, whereby a very large opening isobtained with very. little motion of the valve, and the expeditiousdischarge of the vessel is greatly facilitated.

rlhe accompanying drawing represents a central vertical section ot' anapparatus constructed according to my invention.

A is the vacuum-vessel, which is erected on a chamber, B, of largerdiameter, communieating, by pipes C C, with a water-chest, D, to whichthe suction-pipe of the pump leads. E is an annular guide, within whichthe valve works. It is arranged some distance below the chamber B, andis secured thereto by bolts a a.. The valve is composed of two parts-anannular piece, F, having a flange at its upper edge, and a plate, Gr,secured to it at some distance `from its lower edge by straps or rods bb. Both the ange on the piece F and the upper side of the plate G arefaced with leather washers, and the latter closes against a seat, f, onthe bottom of said guide, and the former against a seat, c, formed onthe bottom of the chamber B. A spiral spring surrounding the valve-guideforces the valve to its seats when not held open by other means. Acondensing-pipe, I, -leads from a dischargebox, H, erected on thewater-chest D to the upper part of the vacuum-vessel. A vacuumcondensation of steam therein or other means, water is forced into it byatmospheric pressure. When the vessel is full, steam is admitted to it,and, by destroying the vacuum, enables the water to be discharged by itsgravity, the valve F G of course opening to permit this. As soon as thereceding water gets below the bottom of the vacuum-vessel, the steamfollows it into the chamber B, and is suddenly expanded, andconsequently its pressure is reduced. About this time the supply ofsteam is shut off, the discharge-valve F Gr closes, and thecondensing-pipe I is induced to operate. Thus a vacuum is formed andwater is caused to iiow up into the vessel from the waterchest. When thevessel is full, steam is again admitted, and, by destroying the vacuumin the vessel A, enables its contents to discharge themselves throughthe valve F Gr. Thus the operation continues.

The great advantage of the discharge-valve F G, constructed asdescribed, is that with a very short motion a very large opening ispresented for the discharge; one opening being presented between the endof the bottom of the guide F and the plate G, and another hetween theflange of the piece F and the bottom of the chamber B.

Wha-t I cla-im as my invention is- The combination of the double valve FG and the seats e and f, when constructed and arranged to operatesubstantially as and for the purpose herein set forth.

WM. BURDON.

Witnesses:

MICHAEL RYAN, DAVID MrsELL.

